在初中英语过去完成时中怎样理解before和by the time

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在初中英语过去完成时中怎样理解before和by the time希望能解答下

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都表示过去的过去的含义 主句的谓语的动作在从句谓语动词之前已完成 we had had supper before we went to the cinema. I had fininshed my homework by the time I went to bed.

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